Asset-Backed Securities Issued - Components of Asset-Backed Securities Issued by Consolidated Securitization Entities Sponsored, Along With Other Selected Information (Details) - Asset-backed securities issued $ in Thousands	Mar. 31, 2023 USD ($) series	Dec. 31, 2022 USD ($) series
Debt Instrument [Line Items]
ABS Issued, Net	$ 8,447,119	$ 7,986,752
Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	(1,038,834)	(1,163,285)
Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	9,291,176	8,944,351
Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	194,777	205,686
Legacy Sequoia
Debt Instrument [Line Items]
ABS Issued, Net	$ 168,832	$ 184,191
Number of series | series	20	20
Legacy Sequoia | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (16,273)	$ (16,036)
Legacy Sequoia | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	3.09%	2.69%
Legacy Sequoia | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	6.06%	5.19%
Legacy Sequoia | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 184,937	$ 200,047
Legacy Sequoia | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	168	180
Sequoia
Debt Instrument [Line Items]
ABS Issued, Net	$ 3,570,597	$ 2,971,109
Number of series | series	19	17
Sequoia | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (642,289)	$ (682,477)
Sequoia | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	2.60%	2.57%
Sequoia | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	5.01%	6.13%
Sequoia | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 4,155,846	$ 3,595,715
Sequoia | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	57,040	57,871
CAFL
Debt Instrument [Line Items]
ABS Issued, Net	$ 3,072,176	$ 3,115,807
Number of series | series	19	19
CAFL | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (275,083)	$ (331,371)
CAFL | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	2.34%	2.34%
CAFL | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	6.39%	5.92%
CAFL | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 3,231,269	$ 3,322,250
CAFL | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	115,990	124,928
Freddie Mac SLST
Debt Instrument [Line Items]
ABS Issued, Net	$ 1,143,522	$ 1,222,150
Range of weighted average interest rates, by series (as a percent)	3.50%
Number of series | series	2	3
Debt instrument, face amount		$ 86,000
Freddie Mac SLST | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (74,952)	$ (99,830)
Freddie Mac SLST | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)		3.50%
Freddie Mac SLST | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)		4.75%
Freddie Mac SLST | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	1,203,589	$ 1,306,652
Freddie Mac SLST | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	14,885	15,328
Freddie Mac K-Series
Debt Instrument [Line Items]
ABS Issued, Net	$ 394,469	$ 392,785
Range of weighted average interest rates, by series (as a percent)	3.41%	3.41%
Number of series | series	1	1
Freddie Mac K-Series | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (20,837)	$ (25,319)
Freddie Mac K-Series | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	408,612	410,725
Freddie Mac K-Series | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	6,694	7,379
HEI
Debt Instrument [Line Items]
ABS Issued, Net	$ 97,523	$ 100,710
Range of weighted average interest rates, by series (as a percent)	3.79%	3.78%
Number of series | series	1	1
HEI | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (9,400)	$ (8,252)
HEI | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	106,923	108,962
HEI | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	0	0
CoreVest
Debt Instrument [Line Items]
Debt instrument, face amount	$ 485,000	$ 485,000